This is a merchant gateway for Blesta that integrates with Cornerstone.
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You can install the gateway via composer:
composer require blesta/cornerstone
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Upload the source code to a /components/gateways/merchant/cornerstone/ directory within your Blesta installation path.
For example:
/var/www/html/blesta/components/merchant/cornerstone/
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Log in to your admin Blesta account and navigate to
Settings > Payment Gateways
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Find the Cornerstone and click the "Install" button to install it
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You're done!